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KU line looks good. What is the difference between the first suji and this one? Did you specify the 2 different lines, or was this more like a sample or what they could provide?

KU suji is thinner, but the bevels are a bit more pronounced - I think it has to do with preserving the KU finish. Great distal taper. This would I would consider a laser suji given the thinness and the grind.
It's 265mm on the edge and 280mm from handle to tip. It weights 125g without a handle.

M

"All beauty that has no foundation in use, soon grows distasteful and needs continuous replacement with something new." The Shakers' saying.

SKD12 steel is Japanese equivalent of AISI A2 steel. Not SS though, just 4.5% Cr. But I figure most of use never really care about SS.

In general A2 is known for toughness in large, heavy duty blades, but if hardness is high, it can be a very solid performer in light cutters too, because it resists chipping mucho better than SKD11(D2). CPM 3V, which is also popular choice in large blades due to its toughness, performs superbly in thin utility knife at 62HRC, one of the reasons I am counting on SKD12 high performance.

I haven't yet tried A2 or SKD12 at hardness close to max, sadly most of the production knives out there are anywhere from 55HRC (CRK knives) to about 59HRC, and as far as I know, A2 can go 61-62HRC, and unlike other steels, it has better toughness at 60+ hardness than in 55-57HRC range.
Given Yoshikane's HT for SKD11, where they go all they way to the max, I'd hope they'll do the same for SKD12 or A2.